Jetson nano not display only green led

I have a Jetson Nano 2GB RAM. The problem is that my Jetson Nano doesn’t display the screen even though the green LED is on. I have formatted and flashed the SD card using balena etcher repeatedly but it still doesn’t show up. what should I do to solve this problem?

Please re-flash with SDK Manager.
Sometimes flashing only the SD card does not solve booting issues.

My board is not detected by sdk manager, what should I do ???
Thank’s for your response

Is this still an issue to support? Any result can be shared?